Just what chain is this?
Just because an entity quotes a section of law does not necessarily mean that they are quoting a law that pertains to the situation.
I'm sure they're quoting this part:
(l) Weapons and explosives. Notwithstanding the provisions of any other law, rule or regulation, no person while on postal property may carry firearms, other dangerous or deadly weapons, or explosives, either openly or concealed, or store the same on postal property, except for official purposes.
I'll bet the hotel didn't include this tiny tidbit:
§ 232.1 Conduct on postal property.
(a) Applicability. This section applies to all real property under the charge and control of the Postal Service, to all tenant agencies, and to all persons entering in or on such property. This section shall be posted and kept posted at a conspicuous place on all such property.
This section shall not apply to—
(i) Any portions of real property, owned or leased by the Postal Service, that are leased or subleased by the Postal Service to private tenants for their exclusive use;
It's not a combination Day's Nite Hotel and Cap'n Ron's Fish 'n' Chips restaurant is it?
Or this:
(b) Inspection, recording presence. (1)
Purses, briefcases, and other containers brought into, while on, or being removed from the property are subject to inspection.
Did the hotel mention that you have to be sober at all times whilst staying there?
(g) Alcoholic beverages, drugs, and smoking. (1) A person under the influence of an alcoholic beverage or any drug that has been defined as a ‘‘controlled substance’’ may not enter postal property or operate a motor vehicle on postal property.
Oh, and you can't smoke:
(2) Smoking (defined as having a lighted cigar, cigarette, pipe, or other smoking material) is prohibited in all postal buildings and office space, including public lobbies.
Lastly, you'll have to remove any political stickers from your car or anything Else of a political nature:
(ii) Absolutely no partisan or political literature may be available, displayed, or distributed. This includes photographs, cartoons, and other likenesses of elected officials and candidates for public office.